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<a name="ARM"></a>
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<hr>
<a name="ARM-1"></a>
<h4 class="subsection">21.3.1 ARM</h4>

<p><small>GDB</small> provides the following ARM-specific commands:
</p>
<dl compact="compact">
<dt><code>set arm disassembler</code></dt>
<dd><a name="index-set-arm"></a>
<p>This commands selects from a list of disassembly styles.  The
<code>&quot;std&quot;</code> style is the standard style.
</p>
</dd>
<dt><code>show arm disassembler</code></dt>
<dd><a name="index-show-arm"></a>
<p>Show the current disassembly style.
</p>
</dd>
<dt><code>set arm apcs32</code></dt>
<dd><a name="index-ARM-32_002dbit-mode"></a>
<p>This command toggles ARM operation mode between 32-bit and 26-bit.
</p>
</dd>
<dt><code>show arm apcs32</code></dt>
<dd><p>Display the current usage of the ARM 32-bit mode.
</p>
</dd>
<dt><code>set arm fpu <var>fputype</var></code></dt>
<dd><p>This command sets the ARM floating-point unit (FPU) type.  The
argument <var>fputype</var> can be one of these:
</p>
<dl compact="compact">
<dt><code>auto</code></dt>
<dd><p>Determine the FPU type by querying the OS ABI.
</p></dd>
<dt><code>softfpa</code></dt>
<dd><p>Software FPU, with mixed-endian doubles on little-endian ARM
processors.
</p></dd>
<dt><code>fpa</code></dt>
<dd><p>GCC-compiled FPA co-processor.
</p></dd>
<dt><code>softvfp</code></dt>
<dd><p>Software FPU with pure-endian doubles.
</p></dd>
<dt><code>vfp</code></dt>
<dd><p>VFP co-processor.
</p></dd>
</dl>

</dd>
<dt><code>show arm fpu</code></dt>
<dd><p>Show the current type of the FPU.
</p>
</dd>
<dt><code>set arm abi</code></dt>
<dd><p>This command forces <small>GDB</small> to use the specified ABI.
</p>
</dd>
<dt><code>show arm abi</code></dt>
<dd><p>Show the currently used ABI.
</p>
</dd>
<dt><code>set arm fallback-mode (arm|thumb|auto)</code></dt>
<dd><p><small>GDB</small> uses the symbol table, when available, to determine
whether instructions are ARM or Thumb.  This command controls
<small>GDB</small>&rsquo;s default behavior when the symbol table is not
available.  The default is &lsquo;<samp>auto</samp>&rsquo;, which causes <small>GDB</small> to
use the current execution mode (from the <code>T</code> bit in the <code>CPSR</code>
register).
</p>
</dd>
<dt><code>show arm fallback-mode</code></dt>
<dd><p>Show the current fallback instruction mode.
</p>
</dd>
<dt><code>set arm force-mode (arm|thumb|auto)</code></dt>
<dd><p>This command overrides use of the symbol table to determine whether
instructions are ARM or Thumb.  The default is &lsquo;<samp>auto</samp>&rsquo;, which
causes <small>GDB</small> to use the symbol table and then the setting
of &lsquo;<samp>set arm fallback-mode</samp>&rsquo;.
</p>
</dd>
<dt><code>show arm force-mode</code></dt>
<dd><p>Show the current forced instruction mode.
</p>
</dd>
<dt><code>set debug arm</code></dt>
<dd><p>Toggle whether to display ARM-specific debugging messages from the ARM
target support subsystem.
</p>
</dd>
<dt><code>show debug arm</code></dt>
<dd><p>Show whether ARM-specific debugging messages are enabled.
</p></dd>
</dl>

<dl compact="compact">
<dt><code>target sim <span class="roman">[</span><var>simargs</var><span class="roman">]</span> &hellip;</code></dt>
<dd><p>The <small>GDB</small> ARM simulator accepts the following optional arguments.
</p>
<dl compact="compact">
<dt><code>--swi-support=<var>type</var></code></dt>
<dd><p>Tell the simulator which SWI interfaces to support.  The argument
<var>type</var> may be a comma separated list of the following values.
The default value is <code>all</code>.
</p>
<dl compact="compact">
<dt><code>none</code></dt>
<dt><code>demon</code></dt>
<dt><code>angel</code></dt>
<dt><code>redboot</code></dt>
<dt><code>all</code></dt>
</dl>
</dd>
</dl>
</dd>
</dl>

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